Loud buzzing when applying brake
I have a 2007 Fleetwood 325rkts. I have never had previous issues. Now I have purchased a 2020 GMC 2500. After connecting the camper to check lights I have a loud buzzing coming from under the cabinet...
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Update, I have now determined that the buzzing also occurs when the hazard lights flash. Buzzes each time the lights come on.It does not do it with blinkers. I pulled down the belly cover but the water tank is in the way. After really listening I am not sure the sound is not coming from behind the rear cap. So, is this some kind of relay that controls the tail lights and LED light bar during braking and hazard operation. Thank you for helping.
